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In-Line Fluid Filter Micron Ratings and Recommendations

How Fine a Filter Do I Need?

Fluid filters are typically rated according to the nominal size of the openings in the filter media. Screen filters can also be rated by the mesh size (or "mesh count"). Mesh sizes can be confusing because they refer to the number of openings per inch. A larger mesh number translates to smaller opening sizes.

General rules of thumb:

For any given size, a coarse filter will flow better than a fine filter. This is why coarse filters are usually recommended for thicker fluids. Increasing the filter size can (partially) compensate for the lower flow of a finer filter.

In any application, it is hard to go wrong with a coarse pre-filter followed by a fine filter. The fine filter protects the machinery, and the coarse filter protects the fine filter from clogging too quickly. Installing the coarse filter before the pump will also protect the pump from damage.